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新盛娱乐游戏APP下载链接【xs10159.com】新盛娱乐游戏下载链接【xs10159.com】复制链接打开浏览器 粘贴点击进入在线开户 注册账号密码  登录游戏充值提现 上下分办理业务 咨询在线客服办理业务【飞机@ xg88011】资金安全可靠 大额无优 public static class Enumerable{    // Extension block    extension<TSource>(IEnumerable<TSource> source) // extension members for IEnumerable<TSource>    {        // Extension property:        public bool IsEmpty => !source.Any();        // Extension method:        public IEnumerable<TSource> Where(Func<TSource, bool> predicate) { ... }    }    // extension block, with a receiver type only    extension<TSource>(IEnumerable<TSource>) // static extension members for IEnumerable<Source>    {        // static extension method:        public static IEnumerable<TSource> Combine(IEnumerable<TSource> first, IEnumerable<TSource> second) { ... }        // static extension property:        public static IEnumerable<TSource> Identity => Enumerable.Empty<TSource>();        // static user defined operator:        public static IEnumerable<TSource> operator + (IEnumerable<TSource> left, IEnumerable<TSource> right) => left.Concat(right);